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Powdered-coal burner and rotary cement kiln using same

A technology of pulverized coal burner and cement rotary kiln, which is applied in the direction of burner, burner, and combustion method of burning powder fuel, and can solve the problems of unable to prevent the mixing of pulverized coal secondary air, complex fluid working conditions, and limited effect , to improve the service life, simplify the structure and increase the temperature

Inactive Publication Date: 2012-07-04
YANTAI LONGYUAN POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex fluid conditions in the calcination chamber, even if this measure is taken, it cannot prevent the mixing of pulverized coal and high-temperature secondary air, and the effect is very limited.

Method used

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  • Powdered-coal burner and rotary cement kiln using same
  • Powdered-coal burner and rotary cement kiln using same
  • Powdered-coal burner and rotary cement kiln using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Please refer to figure 2 , which is a schematic structural view of the pulverized coal burner provided in Embodiment 1. The pulverized coal burner includes a fire source 200 and an internal combustion chamber 100. The internal combustion chamber 100 has a feed inlet 101 and a fire outlet 102, and a combustion section is formed between the feed inlet 101 and the fire outlet 102. In this example, the pulverized coal burner further includes a transition duct 300 which communicates with the pulverized coal duct, and the fire source 200 extends from the transition duct 300 into the internal combustion chamber 100 .

[0047] The transition pipe 300 communicates with the combustion section through the feed port 101 to introduce pulverized coal into the combustion section. In the direction of the pulverized coal flow, the internal combustion chamber 100 has a reasonable length and cross-sectional area, and can maintain the internal pulverized coal flow with a predetermined ex...

Embodiment 2

[0055] Please refer to image 3 , which is a schematic structural view of the pulverized coal burner provided in Embodiment 2. Based on the first embodiment, the internal combustion chamber 100 includes a combustion section 120 and an enlarged inlet section 110 connected to the front end of the combustion section 120 , and the feed port 101 is located at the intersection of the enlarged inlet section 110 and the transition duct 300 . As shown, the cross-sectional area of ​​the inlet amplification section 110 is smaller than the cross-sectional area of ​​the combustion section 120 . When the pulverized coal enters the combustion section 120 with a larger cross-sectional area from the inlet enlargement section 110 with a smaller cross-sectional area, the flow velocity of the pulverized coal will decrease accordingly. In this way, under the condition that the length of the internal combustion chamber 100 does not change, the pulverized coal with a low flow rate needs a longer ti...

Embodiment 3

[0060] It can be understood that when the pulverized coal ignited in the internal combustion chamber 100 enters the calcining chamber of the cement rotary kiln through the fire outlet 102 in the form of a pulverized coal flame, in order to make the pulverized coal flame have higher rigidity, the flow velocity of the pulverized coal flame To adapt to the overall combustion structure of the calcining chamber of the cement rotary kiln, an outlet narrowing section can also be provided in the internal combustion chamber 100 . Such as Figure 5 As shown, this figure shows a schematic structural view of the pulverized coal burner provided by Embodiment 3, which also has an outlet narrowing section 130 connected to the rear end of the combustion section 120; also in order to ensure that the pulverized coal flame velocity changes Relative stability at the time, in the flow direction of the pulverized coal flame, the cross-sectional area of ​​the outlet narrowing section 130 gradually d...

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Abstract

The invention discloses a powdered-coal burner and a rotary cement kiln provided with the powdered-coal burner. The powdered -coal burner comprises a heat source and an internal burning chamber, wherein the internal burning chamber is used for maintaining an internal powdered-coal airflow and has a preset excess air coefficient, the heat source is positioned in the internal burning chamber, the internal burning chamber is provided with a feeding opening, a long cylindrical burning segment and a fire outlet, the feeding opening is communicated with a powdered-coal pipeline, and the fire outletis communicated with the calcining cavity of the rotary cement kiln; and powdered coal passing through the internal burning chamber is burnt by the heat source. The powdered-coal burner provided by the invention can eliminate black powdered-coal fire heads in the calcining cavity, obtain powdered-coal flames with more excellent performance, improve the burning efficiency of the powdered coal and the quality of calcined clinkers, keep the powdered coal in the internal burning chamber to be burnt in the mode of not consuming fuel, simplify the structure of the powdered-coal burner and lower themanufacturing cost and the operating cost of the rotary cement kiln; and meanwhile, the preset excess air coefficient is maintained in the internal burning chamber, so that the reductive burning of the powdered coal is carried out in the internal burning chamber, and the generating quantity and the discharging quantity of fuel-type nitrogen oxides can be reduced.

Description

technical field [0001] The invention relates to cement production equipment, in particular to a pulverized coal burner for a cement rotary kiln, and also to a cement rotary kiln with the pulverized coal burner. Background technique [0002] At present, the cement rotary kiln is the most important equipment in the cement industry. The working process of the cement rotary kiln includes the start-up stage and the normal combustion stage. In the start-up stage, firstly, the calcining chamber of the cement rotary kiln is baked with a fuel flame, and after the temperature of the calcining chamber rises to a predetermined level, pulverized coal is put in to mix the fuel and pulverized coal, and the temperature in the calcining chamber reaches the ignition point of the pulverized coal. After the pulverized coal is ignited, the start-up phase is over, and the cement rotary kiln enters the normal combustion phase. During the normal combustion process, the pulverized coal entering the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/00F27B7/10F27B7/34
Inventor 王雨蓬刘鹏程昌业董永胜宋林波
Owner YANTAI LONGYUAN POWER TECH
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